232 POSITION OF D1NOTHERIUM their small size enabling them to be accommodated in the ja^ together. The skull of Dinotherium is lower than that of JSlepJia or Mastodon. The bones of the skeleton generally are like thos of JSlephiOS. Though a suggestion of marsupial bones attached to the pelvi has been discredited, there is no doubt that Dinotherium oceupie the most primitive position among the Proboscidea; but at tlb same time it cannot be regarded as the ancestor of Elephants, a it is so much specialised in various ways. The incisors for oni thing forbid this way of looking at the creature. It is an ancien genus found in beds of Miocene age in Europe and Asia. It i not known from America. The creature was larger than an; Elephant. Eighteen feet in length has been assigned to it. Th< enormous weight of the lower jaw and tusks seems to argue tha it was at least partially aquatic in habit, and that it may hav< used these tusks for grubbing up aquatic roots or for mooring itself to the bank. At first there were naturalists who considerec it as an ally of the Manatee, and the skull is not unsuggestive o that of the Sirenia. PyrotJiGrium has been referred to the Proboscidea ; but oui knowledge of that form is limited to a few teeth from Patagoniai rocks of an uncertain age.1 They are simple bilophodont molars very like those of Dinotherium. A tusk has been found in tht neighbourhood of these teeth which may possibly belong to the same animal; but it is uncertain. SUB-OKDER 7. HYRACOEDEA. This group of small mammals contains only one well-marked genus which is usually named Hyrax, although Procama seems tc be the accurate term. Popularly these creatures are known as Coneys. They have a singular resemblance to Hodents, the short ears and much reduced tail, besides the squatting attitude adopted eonfecibuting to this merely skin-deep likeness. They agree witt other Ungulates in the structure of the molar teeth, which are mucti like those of Rhinoceros ; in the absence of a clavicle ; in tfce absence of an acromion; in the reduction of the digits of the limbs to four digits in the manus and three in the pes. On the 1 I*ydefcker, <dn* Mug. Za Plata, Pal. Argt iii. 1894.